Activating the Image Slider add-on will allow you to use the Image Slider template in your image galleries.
For each gallery you can create a description that discusses your gallery or adds extra information for anyone viewing the gallery. If enabled, you can choose to put the description above or below your gallery (default is above).
From here you can also reset all of the gallery options to the defaults by checking the Reset option. The action cannot be undone and you will lose any previously saved options for that gallery.